> Z-mode means the front and rear wings are closed which generates more downforce for the corners. In X-mode, the drivers can open the flaps which will reduce drag and increase speed.
Driver-controlled aero has the potential to be way more interesting than the strictly-limited current DRS implementation.
The most interesting DRS era was in 2011-2012 when drivers could operate it (almost) anywhere they wanted in practice and qualifying. There was an element of risk in how early you could open it exiting a corner, and we saw real mistakes from drivers pushing that limit.
More driver controls leads to more opportunities for talented drivers to make a difference, which leads to a better sports product.
The problem with DRS is the zones and only being able to use it when close behind another car. My understanding is the X-Mode can be used pretty much anywhere and anytime.